7221A5

Standard Series High Precision Angular Contact Ball Bearings
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Parts Number

7221A5TYNSUELP4Y

Boundary Dimensions

d 105 mm Bore diameter
D 190 mm Outside diameter
B 36 mm Width
r(min.) 2.1 mm Chamfer Dimension
r1(min.) 1.1 mm Chamfer Dimension

Basic Load Ratings

Cr 195 kN Basic Dynamic Load Rating
C0r 137 kN Basic Static Load Rating

Speeds The limiting speeds of the ball guided cage is lower than the outer ring guided cage.

Grease 6700 min-1 Limiting Speed
Oil (Oil-air) 9500 min-1 Limiting Speed

Dimensions

A5: 25° Contact Angle
a 52.4 mm Effective Load Center

Abutment and Fillet Dimensions

da(min.) 117 mm Diameter of Shaft Abutment
Da(max.) 178 mm Diameter of Housing Abutment
Db(max.) 183 mm Diameter of Housing Abutment
ra(max.) 2 mm Radius of Shaft or Housing Fillet
rb(max.) 1 mm Radius of Shaft or Housing Fillet

Performance

Pa 111 kN Permissible Axial Load

Preload,Rigidity(DB and DF arrangement)

Preload Axial Rigidity Measured axial clearance
EL 862N 268N/μm -15μm
L 1790N 348N/μm -27μm
M 3950N 471N/μm -48μm
H 7929N 625N/μm -77μm

Additional information

21 g/brg Recommended Grease Quantities

Mass

3.77 kg Mass(approx.)
Designations Basic Load Ratings Axial Internal Clearance Accuracy Limiting Speeds Mass
Cr
C0r
min
max
Grease
(min-1)
Oil (Oil-air)
(min-1)

(kg)
7221A5TYNSUELP4Y 195 137 P4Y: Special class (Special bore and outside diameter tolerances, others are ISO Class 4.) 6700 9500 3.77

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More Information
NSK Product Type2 SP_ACBB_ST_A5
NSK Product Type Super Precision Bearing
Designations 7221A5
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